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(EARLY REVIEW/SPECULATIVE) Refactoring syntax spec #429

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(EARLY REVIEW/SPECULATIVE) Refactoring syntax spec #429

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37d3cef
Update syntax.md
aphillips Jul 17, 2023
9cb6870
Update syntax.md
aphillips Jul 17, 2023
18b9f23
Getting closer.
aphillips Jul 17, 2023
9ced15e
typo
aphillips Jul 17, 2023
fa966d9
Update syntax.md
aphillips Jul 17, 2023
a817895
Update syntax.md
aphillips Jul 17, 2023
c73cafd
Update syntax.md
aphillips Jul 17, 2023
7ea597d
Update message.abnf
aphillips Jul 17, 2023
8964700
Update spec/syntax.md
aphillips Jul 21, 2023
3dc98f9
Actually have 3 spaces in example
aphillips Jul 21, 2023
ec767ff
Changes from @stasm's suggestion
aphillips Jul 21, 2023
26dd4c1
Change matcher syntax
aphillips Jul 21, 2023
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17 changes: 10 additions & 7 deletions spec/message.abnf
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Original file line number Diff line number Diff line change
Expand Up @@ -2,21 +2,24 @@ message = [s] *(declaration [s]) body [s]

declaration = let s variable [s] "=" [s] expression
body = pattern
/ (selectors 1*([s] variant))
/ (matcher)

pattern = "{" *(text / expression) "}"

matcher = match 1*([s] selector) 1*([s] variant)
selector = expression
variant = when 1*(s key) [s] pattern

pattern = "{" *(text / expression) "}"
selectors = match 1*([s] expression)
variant = when 1*(s key) [s] pattern
key = literal / "*"

expression = "{" [s] ((operand [s annotation]) / annotation) [s] "}"
operand = literal / variable
operand = literal / variable
annotation = (function *(s option)) / reserved

literal = quoted / unquoted
literal = quoted / unquoted
variable = "$" name
function = (":" / "+" / "-") name
option = name [s] "=" [s] (literal / variable)
option = name [s] "=" [s] (literal / variable)

; reserved keywords are always lowercase
let = %x6C.65.74 ; "let"
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